Doug C. answered 12/25/15
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Math Tutor with Reputation to make difficult concepts understandable
f(x) = x2-2x.
As an example:
f(3) = (3)2-2(3) = 9 - 6 = 3
To find f(c+2) follow a similar pattern.
f(c+2) = (c+2)2-2(c+2) = c2+4c+4 - 2c -4 = c2+2c